Class IX

Solution which has uniform composition throughout is called ___________.
  1. Colloïdal solution
  2. Homogeneous solution
  3. Heterogeneous solution
  4. None of these
Which of the following is NOT true about colloids ?
  1. Particles in a colloid can pass through filter paper
  2. A colloid is a homogeneous solution
  3. Colloidal particles exhibit Brownian motion
  4. Colloidal particles exhibit electrophoresis.
How can we separate cream from milk ?
  1. Centrifugation
  2. Chromatography
  3. Sublimation
  4. Distillation
Nanometer is an
  1. Instrument used for measuring micro-distance
  2. Instrument used for measuring macro-distance
  3. Unit for measuring micro-distance
  4. Unit for measuring macro-distance.
Which one of the following is TRUE for compounds?
  1. It shows properties of its constituents.
  2. It may be homogeneous or heterogeneous
  3. It can be separated by physical methods
  4. It has fixed melting and boiling point
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